Remove vec allocation

graphics/src/widget/canvas/path.rs

@@ -72,13 +72,16 @@ impl Path {
 }
 
 pub(super) fn dashed(path: &Path, line_dash: LineDash) -> Path {
+    Path::new(|builder| {
         let segments_odd = line_dash.segments.len() % 2 == 1;
 
         let segments = segments_odd
-        .then(|| [&line_dash.segments[..], &line_dash.segments[..]].concat())
+            .then(|| {
+                [&line_dash.segments[..], &line_dash.segments[..]].concat()
+            })
             .unwrap_or(line_dash.segments);
 
-    let mut points = vec![];
+        let mut draw_line = false;
 
         walk_along_path(
             path.raw().iter().flattened(0.01),
@@ -87,26 +90,24 @@ pub(super) fn dashed(path: &Path, line_dash: LineDash) -> Path {
                 callback: |position: lyon_algorithms::math::Point,
                            _tangent,
                            _distance| {
-                points.push(Point {
+                    let point = Point {
                         x: position.x,
                         y: position.y,
-                });
+                    };
+
+                    if draw_line {
+                        builder.line_to(point);
+                    } else {
+                        builder.move_to(point);
+                    }
+
+                    draw_line = !draw_line;
+
                     true
                 },
                 index: line_dash.offset,
                 intervals: &segments,
             },
         );
-
-    Path::new(|builder| {
-        for (idx, point) in points.into_iter().enumerate() {
-            let is_even = idx % 2 == 0;
-
-            if is_even {
-                builder.move_to(point);
-            } else {
-                builder.line_to(point);
-            }
-        }
     })
 }